In this October 2009 file photo, a U.S. Army soldier watches the sun set at the U.S. Naval Base in Guantanamo Bay, Cuba. (Photo Credit: Getty Images/File)

Washington (CNN) - It's unclear when President Obama may ultimately close the Guantanamo Bay, Cuba, terrorist detention facility, his senior adviser said in an interview broadcast Sunday.

"I believe we're going to get there, but it's complicated," David Axelrod told the CNN program "State of the Union," adding that there has been progress toward closing the facility.

Upon taking office in January 2009, the Obama administration said it intended to shut down the controversial detention facility in a year. That deadline has slipped, with no specific date announced for closing Guantanamo.

Washington (CNN) - Two of President Barack Obama's top advisers said Sunday the new nuclear arms treaty with Russia will help bring Russian support for sanctions against Iran over its nuclear ambitions.

David Axelrod and Valerie Jarrett, two senior White House advisers, said increased trust with Russia through the START treaty expected to be signed on April 8 would bring increased cooperation with Moscow in the dispute.

"I believe we'll have a strong regime of sanctions" against Iran, Axelrod said on the CNN program "State of the Union," adding that he believed Russia would support the sanctions.

Jarrett, on the ABC program "This Week," said the new START treaty helps pave the way for cooperative steps against Iran.

(CNN) - One of President Obama's Saturday recess appointments to the National Labor Relations Board quickly triggered intense opposition from business groups and Republicans, who called the appointee a radical who represents a White House gift to labor unions.

The fury is aimed at Obama's appointment of Craig Becker - a labor lawyer - to the NLRB, the federal agency that oversees relations between unions and employers.

"Mr. Becker's prolific writings ... suggest a radical view of labor law that flies in the face of established precedent and case law and is far outside the mainstream," the U.S. Chamber of Commerce said in a statement Saturday.